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POProcess access rights seem to differ when run from the compiler and as a standalone exe
 

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    <p>I am using WINAPI for a program that I am writing. The program has the ProcessId of another process and needs to get a handle of it (to be able to terminate it later, and also to periodically check if the process is alive and responding by using WaitForSingleObject). When I compile my program (in Embarcadero RAD Studio 2010 C++ Builder), it works well; the program seems to get the handle successfully and generally works as intended. However, if I launch it from the folder as a standalone exe, it seems to fail to get the handle properly. I checked it by comparing (Companion is a HANDLE and Companion_PID is a DWORD):</p> <pre><code>GetProcessId(Companion) </code></pre> <p>and</p> <pre><code>Companion_PID </code></pre> <p>Where, a few lines earlier, Companion is taken from Companion_PID in the following code:</p> <pre><code>Companion = OpenProcess(PROCESS_ALL_ACCESS, FALSE, Companion_PID); </code></pre> <p>And the "GetProcessId(Companion)" results in 0 (which is a good sign that the OpenProcess failed to return a proper handle.</p> <p>I'm pretty surprised that this code works differently when run from the compiler and as a standalone exe; I'm assuming in the first case the security attributes are inherited from the compiler itself, but I'd like to hear a possibly better explanation for this behaviour from someone more experienced in WINAPI and security attributes in particular.</p> <p>Small update: yes, like I thought, OpenProcess results in error 0x5 = ERROR_ACCESS_DENIED.</p>
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